Abstract: In view of the problems of the existing new backward extrusion process such as large load and easy cracking of the parts, a new backward extrusion process for optimizing extrusion channel was proposed, and the shape of the radial extrusion channel was designed and quantitatively calculated, and a diversion device was added. Using Deform 3D software,the existing backward extrusion process and the improved process were numerically analyzed and compared, the metal flow law, load variation law, and the damage, strain field, streamline distribution and their evolution law of the backward extrusion process of cylindrical parts were studied. The results show that compared with the existing backward extrusion process, the improved backward extrusion process has obvious effect on the forming optimization, which can improve the formability and performance of thin-walled cylindrical parts, reduce the load, obtain more uniform strain, smaller damage value and better streamline.